What has caused a painless blood-shot eye in a child?

Hello,

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From the pictures you have attached (attachment removed to protect patient identity), I can tell you that the most probable cause of this redness is a benign condition called nodular episcleritis. It is a form of allergic reaction of the body to certain substances and normally subsides over a few days to weeks. It is not contagious but does recur in a few patients. My advice to you is do not rub or meddle with the eye, this only aggravates the condition. Use over-the-counter lubricant eyedrops- Refresh tears 0.5 % four times a day until the redness goes away. Avoid dusty, windy, sunny weather. You should see an ophthalmologist in case there is a sticky sensation in your eyelids which does not let you open them after sleep in the mornings. There is a drop in the ability to see, this is best seen by closing one eye and trying to see with the other. The redness increases or she starts developing new symptoms or the redness does not go away even after a week.